Miya Pearson
When shopping for a sleeping bag, it's important to consider the temperature rating, which indicates the bag's warmth and suitability for different conditions. Sleeping bags are assigned a comfort rating and a lower-limit rating. The comfort rating indicates the temperature at which a cold sleeper might feel comfortable, while the lower-limit rating indicates the temperature at which a warm sleeper might still feel comfortable. These ratings are based on standardized laboratory tests that use a heated mannequin dressed in base layers and a sleeping pad. It's important to note that these ratings are estimates and may not reflect your personal comfort level, so it's recommended to consider your own internal thermostat when choosing a sleeping bag.
| Characteristics | Values |
|---|---|
| Temperature Rating | Comfort and Lower Limit |
| Comfort Rating | Indicates the temperature at which a cold sleeper might feel comfortable |
| Comfort Rating Users | Women |
| Lower Limit Rating | Indicates the temperature at which a warm sleeper might still feel comfortable |
| Lower Limit Rating Users | Men |
| EN Comfort Rating | Air temperature at which an average female can sleep comfortably through the night |
| EN Lower Limit Rating | Air temperature at which a standard male can sleep for eight hours without waking |
| EN Extreme Rating | Temperature at which a standard female can remain for six hours without the risk of death from hypothermia |
| ISO Comfort Rating | Temperature range at which a standard woman is "not feeling cold" while sleeping in a "relaxed posture" |
| ISO Transition Range | Where a standard man is "in a situation of fighting against cold (posture is curled up inside the sleeping bag), but in thermal equilibrium" and not shivering |
| ISO Extreme Range | A strong sensation of cold has to be expected. There is a risk of health damage by hypothermia |
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What You'll Learn
- The 'tested lower limit' is a guideline, not a guarantee
- The limit is based on standardised laboratory tests
- The ISO lower limit rating is often different from the rounded number in a bag's name
- The lower limit is always lower than the comfort rating
- The comfort rating is used for women's bags, the lower limit for men's bags
The 'tested lower limit' is a guideline, not a guarantee
Sleeping bags have temperature ratings that indicate their warmth and suitability for different conditions. The two most important temperature ratings are the comfort rating and the lower-limit rating. The comfort rating indicates the temperature at which a cold sleeper might feel comfortable, while the lower-limit rating (which is always lower than the comfort rating) indicates the temperature at which a warm sleeper might still be comfortable. These temperature ratings are determined through standardized laboratory tests, which simulate how a sleeping bag is used.
However, it is important to remember that these temperature ratings are estimates and not guarantees. The tested lower limit is a guideline, not a guarantee. This is because there are many factors that can affect how warm or cold you feel when sleeping outdoors. For example, the clothing and gear you use, your body type, the weather conditions, and even the food you eat can all impact your comfort level. In addition, temperature ratings are based on general presumptions about muscle mass and may not accurately reflect your personal internal thermostat.
Therefore, it is recommended that you take your own internal thermostat into account when choosing a sleeping bag. If you frequently feel cold, it is suggested to use the comfort rating as a baseline and select a bag with a lower comfort figure than the coldest expected temperature. On the other hand, if you tend to sleep warm, you may be able to rely on lower-limit ratings, but it is still advised to give yourself a buffer of a few degrees Celsius.
It is also worth noting that not all sleeping bags have an ISO (or EN) rating. The test standard is not valid for bags designed for extreme cold or children's bags. Brands may also choose not to obtain ISO testing for bags intended for mild conditions or casual use. In these cases, the "temperature rating" spec is likely the brand's estimate and should be used as a rough guideline rather than a rating that can be compared to similar bags from other brands.
In conclusion, while the tested lower limit can be a useful guideline when choosing a sleeping bag, it is not a guarantee of comfort or warmth. It is important to consider your own personal needs and preferences, as well as the specific conditions in which you plan to use the sleeping bag, to make an informed decision.
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The limit is based on standardised laboratory tests
The limit referred to in the term "tested lower limit" is the lower limit of temperature that a sleeping bag should be used in. This limit is based on standardised laboratory tests that produce a rating range for each sleeping bag, with two temperature ratings within that range: the comfort rating and the lower limit rating. The comfort rating indicates the temperature at which a cold sleeper might feel comfortable, while the lower limit rating (which is always lower than the comfort rating) indicates the temperature at which a warm sleeper might still be comfortable.
The standardised tests used to determine these ratings are known as EN and ISO tests. These tests involve using a heated mannequin wearing a long underwear top and bottom, a hat, and a closed-cell foam sleeping pad. The EN system offers four ratings, but the most relevant are the "EN Comfort" and "EN Lower Limit" ratings. "EN Comfort" is the air temperature at which an average woman can sleep comfortably through the night, while "EN Lower Limit" is the temperature at which a standard man can sleep without waking. The ISO system has similar Comfort and Lower Limit ratings, but it also includes three different temperature ranges: the Comfort Range, the Transition Range, and the Extreme Range.
It's important to note that these temperature ratings are just guidelines, and the actual comfort level of a sleeping bag may differ when used outdoors. Individual factors such as muscle mass, age, and personal internal thermostat can also affect how warm or cold one feels when using a sleeping bag. Therefore, it's recommended to consider one's own internal thermostat when choosing a sleeping bag and to give oneself a buffer of a few degrees Celsius when relying on lower limit ratings.
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The ISO lower limit rating is often different from the rounded number in a bag's name
The ISO lower limit rating is the temperature at which a warm sleeper might still feel comfortable. This is the temperature rating used for men's sleeping bags. However, the ISO lower limit rating is often different from the rounded number in a bag's name. This is because, for simplicity, brands will often round up or down to the nearest 0 or 5 when naming their bags. For example, the Men's "Snugglebuggle" 15 Bag might actually have an ISO lower-limit rating of 18 degrees Fahrenheit. Therefore, it is important to look at the actual test rating on a bag, rather than just the number in its name.
The ISO Comfort and Lower Limit ratings are very similar to the EN system. However, the ISO system also gives three different temperature ranges: the Comfort Range, the Transition Range, and the Extreme Range. The Comfort Range is defined as the temperature range in which a standard woman is "not feeling cold" while sleeping in a relaxed posture. The Transition Range is where a standard man is "in a situation of fighting against cold (posture is curled up inside the sleeping bag), but in thermal equilibrium" and not shivering. The Extreme Range states that "a strong sensation of cold has to be expected" and that there is a risk of health damage by hypothermia. It is important to note that the ISO and EN ratings are just standardised ranges, and individual perceptions of cold can vary.
The Comfort and Lower Limit ratings are not guaranteed temperatures but rather guidelines. A male sleeper who 'sleeps cold' may prefer to use the 'Comfort Rating' rather than the 'Lower Limit'. It is important to consider your own personal internal thermostat when choosing a sleeping bag. If you frequently feel cold, use the comfort ratings as a baseline and choose a bag with a significantly lower comfort figure than the coldest expected temperature. If you sleep warm, you might be able to rely on lower limit ratings, but it is still recommended to give yourself a buffer of a few degrees Celsius.
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The lower limit is always lower than the comfort rating
When it comes to sleeping bags, the lower limit rating is always lower than the comfort rating. This is because the comfort rating indicates the temperature at which a cold sleeper might feel comfortable, while the lower limit rating indicates the temperature at which a warm sleeper might still be comfortable.
The comfort rating is typically used for women's sleeping bags, as data shows that the ""average woman" will feel colder in the same bag as the "average man". It takes more insulation to ensure a bag's comfort rating matches its lower-limit rating, which is why women's bags usually weigh more. The lower limit rating, on the other hand, is usually used for men's bags.
It's important to note that temperature ratings are just estimates, and the actual comfort level of a sleeping bag can differ when used outdoors. This is because the ratings are based on standardised laboratory tests that simulate how a sleeping bag should be used. While these tests ensure consistency, they cannot account for individual variations such as clothing, body type, weather conditions, and other factors.
When choosing a sleeping bag, it's recommended to consider your own personal internal thermostat. If you frequently feel cold, opt for a bag with a comfort rating that matches your needs. If you tend to sleep warm, you may rely on the lower limit rating, but it's still advisable to allow for a buffer of a few degrees Celsius, especially in colder regions or at higher altitudes.
Both the EN and ISO testing methods include using a heated mannequin dressed in base layers and a sleeping pad. The EN system offers four ratings, but the most relevant are the EN Comfort and EN Lower Limit. The ISO system is similar, with ISO Comfort and ISO Lower Limit ratings. These standardised ranges help consumers choose the right sleeping bag for their needs, but it's important to remember that individual factors can also impact one's warmth in a sleeping bag.
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The comfort rating is used for women's bags, the lower limit for men's bags
When choosing a sleeping bag, the key factor to consider is its temperature rating. Sleeping bags are given a comfort rating and a lower-limit rating through standardised laboratory tests. The comfort rating indicates the temperature at which a cold sleeper might feel comfortable. This is the temperature rating used for women's bags. The lower limit rating, which is always lower than the comfort rating, indicates the temperature at which a warm sleeper might still feel comfortable. This is the temperature rating used for men's bags.
The use of these ratings for women's and men's bags, respectively, is based on data highlighting physiological differences between the traditional genders. On average, women tend to feel colder than men in the same environment. Therefore, the comfort rating, which is meant for colder sleepers, is used for women's bags. Conversely, men's bags typically feature a lower limit rating, catering to warmer sleepers.
It is important to note that temperature ratings are estimates rather than precise indicators of performance. Laboratory tests simulate sleeping conditions by placing a bag on a sleeping pad with a test dummy inside dressed in base layers. While this standardised approach ensures consistency across tests, it cannot account for various real-world factors. These factors include differences in clothing, gear, body types, weather conditions, and individual characteristics, all of which can influence the actual comfort level experienced when using a sleeping bag outdoors.
When selecting a sleeping bag, individuals should consider their sleeping habits and preferences. If you tend to sleep warm, opting for a bag with a lower limit rating can help avoid excessive insulation and weight. Conversely, if you are a cold sleeper, prioritising bags with a comfort rating that aligns with your desired temperature range is advisable. It is also worth noting that not all sleeping bags have an ISO or EN rating, particularly those designed for extreme cold, mild conditions, or casual use. In such cases, the temperature specifications provided by brands are likely estimates rather than standardised test results.
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Frequently asked questions
The lower limit rating is the temperature at which a warm sleeper might still feel comfortable. This is the temperature rating brands use on men's bags.
Standardized laboratory tests produce a rating range for each sleeping bag. The lower limit rating is determined by placing a sleeping pad under the bag and a test dummy inside the bag dressed in base layers.
The comfort rating indicates the temperature at which a cold sleeper might feel comfortable. This is the temperature rating brands use on women's bags. The lower limit rating is always lower than the comfort rating.
